Hey all,
I have a 5V 200mA project and am using solar with a small SLA battery to power it. My problem is that I'm uncertain as to what I need to build for a solar charge controller, or if I should just buy one.
Battery: 12V 7AH SLA
(Standby , 13.5V-13.8V , Current:No limit )
(Cycle Use , 14.4V-15.0V , Current: 0.3 Capacity)
Solar Panels: 2 x 20 W Panels
(17.2V Max 1.17A Max )
( Open Circuit 21.6V (I measured at ~19V) , Short Circuit Current 1.28A)
So I have 4 questions here:
1. Are my panels and battery sufficient for my project?
2. I want to try building a charge controller , but would it be just easier to buy a morningstar ss-6 for 50$?
3. Contingent on 2, am I right in thinking that I can use an atmega chip to PWM a voltage regulator from the panels based on the voltage level of the battery? Or something easier? I don't mind losing some power for a simpler circuit.
4. How do you properly run a load and charge a battery at the same time? I can't just put everything in parallel... can I? I thought I read somewhere it causes problems with the battery.
Thanks for your time all, and if anyone knows of a controller circuit diagram that fits my question more or less please share !
I have a 5V 200mA project and am using solar with a small SLA battery to power it. My problem is that I'm uncertain as to what I need to build for a solar charge controller, or if I should just buy one.
Battery: 12V 7AH SLA
(Standby , 13.5V-13.8V , Current:No limit )
(Cycle Use , 14.4V-15.0V , Current: 0.3 Capacity)
Solar Panels: 2 x 20 W Panels
(17.2V Max 1.17A Max )
( Open Circuit 21.6V (I measured at ~19V) , Short Circuit Current 1.28A)
So I have 4 questions here:
1. Are my panels and battery sufficient for my project?
2. I want to try building a charge controller , but would it be just easier to buy a morningstar ss-6 for 50$?
3. Contingent on 2, am I right in thinking that I can use an atmega chip to PWM a voltage regulator from the panels based on the voltage level of the battery? Or something easier? I don't mind losing some power for a simpler circuit.
4. How do you properly run a load and charge a battery at the same time? I can't just put everything in parallel... can I? I thought I read somewhere it causes problems with the battery.
Thanks for your time all, and if anyone knows of a controller circuit diagram that fits my question more or less please share !